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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pjhBU-00FPcl-Co; Tue, 04 Apr 2023 13:58:52 +0000 From: "Matthew Wilcox (Oracle)" To: Suren Baghdasaryan Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Punit Agrawal Subject: [PATCH 4/6] mm: Move FAULT_FLAG_VMA_LOCK check down in handle_pte_fault() Date: Tue, 4 Apr 2023 14:58:48 +0100 Message-Id: <20230404135850.3673404-5-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230404135850.3673404-1-willy@infradead.org> References: <20230404135850.3673404-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 65F9920004 X-Rspamd-Server: rspam01 X-Stat-Signature: 51sf3wfexie9owgwcf1rbbbfotiaxsmb X-HE-Tag: 1680616738-468638 X-HE-Meta: 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 sAaBNarS bcV72/nrRdH4oCIjgSFmVx9eIQiwyK1eIV6JJh8ua2xacht75MctkJOqOyLfYhr1vJ6AM6JTic5IXEVhDEwnXG+a5rYpy+dsEhZA1N4m4L14GFli1ez/uFR0YNT9Llmi1l3XfNWD7EgSbFqMY0ITxoFwgQKVkubucULLwi7De3kuhAwwU152G00tsZjLboQRcUFMZPrhSURNHYpubxQMHzri/akqoj1ki2grPj645laiPYidich/Zd5+1Vg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Call do_pte_missing(), do_wp_page() and do_numa_page() under the VMA lock. The first two gain the check, but do_numa_page() looks safe to run outside the mmap lock. Signed-off-by: Matthew Wilcox (Oracle) --- mm/memory.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index a2e27403e4f1..dc2baddc6040 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3329,6 +3329,9 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf) struct vm_area_struct *vma = vmf->vma; struct folio *folio = NULL; + if ((vmf->flags & FAULT_FLAG_VMA_LOCK) && !vma_is_anonymous(vma)) + return VM_FAULT_RETRY; + if (likely(!unshare)) { if (userfaultfd_pte_wp(vma, *vmf->pte)) { pte_unmap_unlock(vmf->pte, vmf->ptl); @@ -3644,6 +3647,8 @@ static vm_fault_t do_pte_missing(struct vm_fault *vmf) { if (vma_is_anonymous(vmf->vma)) return do_anonymous_page(vmf); + else if (vmf->flags & FAULT_FLAG_VMA_LOCK) + return VM_FAULT_RETRY; else return do_fault(vmf); } @@ -4896,9 +4901,6 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf) { pte_t entry; - if ((vmf->flags & FAULT_FLAG_VMA_LOCK) && !vma_is_anonymous(vmf->vma)) - return VM_FAULT_RETRY; - if (unlikely(pmd_none(*vmf->pmd))) { /* * Leave __pte_alloc() until later: because vm_ops->fault may @@ -4957,6 +4959,9 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf) if (pte_protnone(vmf->orig_pte) && vma_is_accessible(vmf->vma)) return do_numa_page(vmf); + if ((vmf->flags & FAULT_FLAG_VMA_LOCK) && !vma_is_anonymous(vmf->vma)) + return VM_FAULT_RETRY; + vmf->ptl = pte_lockptr(vmf->vma->vm_mm, vmf->pmd); spin_lock(vmf->ptl); entry = vmf->orig_pte; -- 2.39.2